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@article{DE_1985_21_9_a18, author = {G. M. Amatova}, title = {Singular points of systems with shocks}, journal = {Differencialʹnye uravneni\^a}, pages = {1613--1615}, publisher = {mathdoc}, volume = {21}, number = {9}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_9_a18/} }
G. M. Amatova. Singular points of systems with shocks. Differencialʹnye uravneniâ, Tome 21 (1985) no. 9, pp. 1613-1615. http://geodesic.mathdoc.fr/item/DE_1985_21_9_a18/